34, have occasional pink, red, or brown spotting in weeks 3 & 4 of my period on cryselle, 4 yrs. my dr ran many tests and did ultrasound and said my reproductive system is healthy. why am i still spotting? what birth control can i switch to stop?

Higher estrogen : Breakthrough spotting is a common side effect of most hormonal contraceptives. Occasionally women find that changing to an oral contraceptive with higher estrogen levels or step wise increases (tri-phasil) in estrogen levels helps to prevent the spotting. Talk to your Dr about a potential change in your Oral contraceptive pill.